Dell G5 5090 Motherboard Power Cable Pinout - Upgrade Help!

Standard PSU won't "Fit" inside the case.

Standard PSU doesnt have a vendor that is willing to make an adapter.

I dont know of any vendor that supports an adapter.

Not willing to figure it out because its not a passive one to one cable swap.

The power supply has 12v SB   2AMPS and 12v 4 pin  X  2  18 Amps max

and  12v 18 Amps for PCi-E aux power

Number of pins is not relevant

There are 5 connectors total.   1   6 pin Proprietary,  2 X 4 pin Proprietary

2 AUX  PCI-E  connectors.

If someone has a solution I havent seen it and I doubt I will.

Thank you @speedstep 

So, the dual PSU idea looks like the way to go! Unless you feel otherwise, it sounds too easy.

I've since searched and dual PSU is reasonably common practice.

Thanks!

FPS used to make A 450w  AUX VIDEO POWER SUPPLY

They claimed it would be certified by UL and Nvidia

This never happened and the BOOSTER power supply is no longer made.

I suspect there were problems with patents or safety or something but I have no clue.

https://www.atxpowersupplies.com/500-Watt-Power-Supply-FSP-Booster-X5.php

https://www.newegg.com/fsp-group-booster-x5-450w/p/N82E16817104054#

450W VIDEO POWER

BOOSTER X5

Dual psu is done all the time but that does not mean its safe or that it fits inside the case.

ymmv

Thats what this user did using the paperclip method.

only for video card ALL OTHER CONNECTORS UNUSED

https://www.youtube.com/watch?v=qa9b0TkTsLM

8 pin EPS to 4+4 pin ATX-12V adapter.  this allow psu EPS 8 pin to connect to 4 + 4 pin CPU on G5 5090 motherboard.

EPS 8 pin to 4+4 pin ATX 12V

note this Y adapter is different from split EPS 8 pin to 2x4 pin.

a true ATX 12V connector has beveled pin 2/3 and square pin1/4.

ATX 12V

https://www.coolerguys.com/products/8-pin-eps-molex-power-male-y-to-2-4-pin-pentium-power-eps

@redxps630 

 Nio thats wrong.

4+4  EPS 12v has different pin Keying.

The 4 pin and 4 pin on the G5 is not standard keying and both connectors are keyed the same.

https://help.corsair.com/hc/en-us/articles/360043469632-How-to-Connect-a-PSU-to-a-4-pin-CPU-port

Your advice is potentially dangerous and could cause a system to FRY and DIE.

You show a cable but have no link or reference to what that is nor do you show the keying as I do in the picture below.

Edit so I found your link  this cable is NOT compatable with the G5

No such mention of using it for that purpose.

https://www.coolerguys.com/products/8-pin-eps-molex-power-male-y-to-2-4-pin-pentium-power-eps

Only one side fits the other does not

@RoHe @redxps630 

Hey Guys, I tried reaching out with the same representative from COMeap who helped me out a great deal the first time.

After looking into the pinouts for the Dell 5090 vs the one for the adapter they made for the Optiplex series, they were able to confirm it has identical pinouts to their adapter, the only difference being the non-standard colour coding of the individual wires. This means that the adapter can in fact work with the Dell G5! 

Here is a link to the adapter. 

https://www.amazon.ca/COMeap-Power-Adapter-Motherboard-13-3-inch/dp/B08M5BZ6P8/ref=sr_1_1?dchild=1&keywords=B08M5BZ6P8&qid=1610502816&sr=8-1 

They were kind enough to let me try out the cable and test if it worked, and if not they would refund the product without further issue. I currently asked if they could test the product for me as I did not want to risk frying my computer in case lol. 

But hey, if this works out, it would be the first viable solution to finally getting around this massive pain in the . Only thing left to figure out would be the 2 4-pin CPU connectors. 

that sounds good.  the 6 pin is not a deep mystery.  now you have multiple independent sources confirming the pinout.  that should make you feel more confident.

Re: Only thing left to figure out would be the 2 4-pin CPU connectors. 

it is already figured out.  It is really not proprietary at all, although some users have called these connectors "proprietary".  Optiplex 3050 psu 4FWF7 is interchangeable with G5.  3050 motherboard has only one 4 pin ATX-12V connector compared to two 4-pin connectors in G5 (and XPS 8940).  Dell does not need to make a special psu just for 3050.  so the generic TFX psu for these models all have two 4 pin cpu plus the 6 pin.  That means for 3050, you can use either one of the two provided 4 pin for the single 4 pin connector on its motherboard.  The two 4 pin of psu are identical in spec and connector which correspond to identical 4 pin connectors on motherboard.  G5 (and 8940) has two identical 4 pin ATX-12V connectors in order to provide more 12V power to the newer Intel cpu for its higher TDP and overclocking, which is not needed for business class optiplex model.  Therefore, whether it is two or one 4-pin, they are the simple conventional old fashioned 4 pin ATX-12V that you find on ancient ATX motherboards.

For users who have modular psu that has two EPS 8 pin ports, connect both ports to the 4 pin connectors on G5 after splitting the 8 pin to 4 pin.

For users who have nonmodular psu that has only one EPS 8 pin connector, use the coolerguys 8 pin to 4+4 pin Y splitter to make two identical 4 pin ATX-12V connectors.

For optiplex 3050 (same 6 pin as G5), low power (180W and 240W) psu have only one 4 pin and one 6 pin.  for the higher power (460W) psu 4FWF7, you have two 4 pin and one 6 pin.  As you may intuitively guess, two 4 pin connectors correspond to higher 12V rail power the psu can supply. 

To recap ad nauseum, the two 4 pin connectors of G5 psu are identical, and the two 4 pin G5 motherboard pinout is identical to single 4 pin cpu connector on 3050 motherboard.

optiplex 3050G5 5090

@AdiMann 

have you or anyone tested the adapter yet? 

@AdiMann : have COMeap told you whether they've tested the cable with a G5?

The other big problem, once cabling is sorted out, is ensuring that the SFX PSU you put in there gets enough ventilation. Most SFX PSUs would fit into the G5 case with their fan pointing up, pulling air away from the GPU fans. The GPU fans (at least on my RTX 3070) are designed to pull air into the card, so you got a situation where the PSU fan and the GPU fan pull air from each other (while being very close together). I worry that this might end up in the GPU overheating.

Flipping the PSU the other way doesn't work either, as you'd have to cut the back of the case to fit the power plug, and the PSU fan would be very close against the bottom of the case, so not very efficient.

Check out this video starting at 4:30. The guy managed to fit a SFX PSU into an Optiplex case. Different case, but same situation with the PSU at the back of the case. He ended up having to cut into the case to provide enough ventilation to the PSU.

They haven't validated this with the G5 because that's not the only hurdle.

If you blow up your system based on hearsay that's not a warranty issue.

They can tell you anything but the only thing that counts is in writing.

Re: Check out this video starting at 4:30. The guy managed to fit a SFX PSU into an Optiplex case.

interesting mod.  The custom psu shroud in this mod is worth considering for both practical and esthetic purposes.

@redxps630 agreed on the shroud. I love what he did with it. He initially put it there for purely aesthetic reasons, to hide the spaghetti of cables from the non-modular PSU he used. But it could help with airflow too, indeed. Lots of Dremel cutting though. Of the shroud and the case itself to fit the PSU. He found that case in the trash, so he didn't care. I would not do that to my new case, lol. Maybe in a few years

@AdiMann  any luck with your free trial?